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    <h1>第七章目录：</h1>
    <p><a href="7.1.html">改变和字大小</a></p>
    <p><a href="7.2.html">例7-3</a></p>
    <p><a href="7.3.html">标签栏切换效果</a></p>
    <p><a href="default.html">返回首页</a></p>
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